Roller bit



J. T. PHIPPS ROLLER BIT Filed Sept. 27. 1929 2 Sheets-Sheet 1 Tia. l Y

s Rfifly WP m r M a n 7 6 U 0 on. J ulliilllr i m 5 M Z .I 361? fi M 4.0 4 v 9 M 5 .0 o 00 Q. a 4.0 i fl/Afi J 5 40 m 3 V Patented July 19, 1932 UNEE STATES JOHN T. rrrrrrs, or HUNTINGTON PARK, CALIFORNIA, ASSIGNOR, BY MnsNn AssIGN MENTS, TO GLOBE GIL TOOLS COMPANY, OF LOS ANGELES, CALIFORNIA, A OOB-PQRA TION OF CALIFORNIA ROLLER 1311* Application fil ed September 27, 1929. Serial No. 395,574. i

This invention relates to a bit having roller cutters and pertains more especially to the pin mounting for journalling the cutters on the bit head. It has been the common practice to place roller cutters in heads by employing pins set in forked or grooved portions of the head. due to the abrasive action of the material being drilled through, requiring replacement at frequent intervals. These pins have generally been secured in the head in such a manner that when replacementis required the entire head mustbe rebuilt.

It is the primary object of this invention to provide a ournal pin mounting in which the pin is easily removed and replaced. A

more specific object is the provision of a, novel pin and lock washer constructlon as will be apparent from the subjoined speciiication.

The drawings illustrate the journal pin mounting as applied to a bit adapted to take a core, in which its advantages are particularly marked, but it is also useful in any type of bit. In the drawings, Fig. 1 is an elevation, partly in section, of a core barrel fitted with a bit or head having roller cutters journalled on pins mounted in accordance with my invention; Fig. 2 is a view similar to Fig. 1 but taken at right angles thereto; Fig. 3 is a bottom plan view on an enlarged scale of Fig. 1; Fig. t is a detail on an enlarged scale of one cutter and pin, similar to Fig. 1; Fig. 5 is a detail on an enlarged scale of one cutter and pin similar to Fig. 2; and Fig. 6 is a perspective view of one of the pins and Washers before mounting in the head.

Referring more particularly to the drawings, the barrel or body of the tool is indicated by 8 and has a bithead 9 threadedly secured to its lower end and a threaded pin 10 at its upper end, by which it may be attached to the drill string. Within the body is the core retainer tube 11 and core catching means 12. These form no part of the present invention and will not be further described. The head is tubular being formed with a substantially cylindrical central wall 14. Cavities are formed in which are sets of when The pins wear rapidlycutters marked l5aand 157).: The cutters are 1ournalled on pins 16a-and 166 which are mounted in bores extendingin the. head Referring to Figs. 5 and 6, it willbe seen that pin 1664 makes anoblique anglewith the axis of the tool. Pin 16a is provided with a head 17 and a portion of reduced diameter 18. The shoulder 19 which is formed where is then placed on the-reduced portion in the 'counterbore, and the end-of the reduced portion is'riveted over to hold the washer in place. It may be welded if preferred. It- Will be evident that the pin is held against both rotary: and longitudinal movement.

l/Vhen it is desired to remove the pin, as when itbecomes worn or'the cutter becomes dull, the welded or burre'd portion of-the pin holding the washer may be out out, which will allow the washer to'come oif and the pinto slip out. No cutting or damage to the head is necessary, and a new cutter can be installed and the pin replaced. The head 17 has been shown at right angles to the axis of the pin,

which is desirable from a manufacturing standpoint, but it could be at any other ans gle that might be desirable. It will be obvious from the drawings that rollers 15?) and pins 162) involve the same inventive idea. Pins 16?) are substantial duplicates of pins 16a. However in the bit rollers 15a toe in and rollers 15?) toe out with respect to the drilling axis of the tool. j

1. Arotary drilling tool having roller cute side so that the shoulder 19 registers with the bottom of thecounter bore, thewasher 21.

ters, comprising a body witha cavity for a cutter and provided with cavity side walls having alined cylindrical bores for acutterjournal pin with a counterbore at one end ob lique to the main axis of said bores, a cutter journal pin detachably mounted therein having a head at one end and a washer set in said counterbore and secured at 1ts other end to said pin whereby sald p n 18 secured against rotary and longitudinal movement, and a cutter journalled on said pin.

2. A rotary drilling tool having roller cutters, comprising a body with a cavity for a cutter and provided with cavity side walls having alined cylindrical bores for a cutter journal pin, said bores making an oblique angle with the axis of the tool with a counter bore at the outer end oblique to the main axis to the said bores, a cutter journal pin in said bores having a head at one end and a washer set in said counterbore and secured at its other end parallel to the drilling axis of and flush with the outer surface of said body, whereby said pin is held against rotary andlongiti'idinal movement, and a cutter journalled on said pin.

3. A rotary drilling tool having roller cutters, comprising a body with a cavity for a cutter and provided with cavity side walls having alined cylindrical bores for a cutter journal pin with a counterbore at the outer end oblique to the main axis of said bores, said bores making an oblique angle with the axis of the tool, a cutter journal pin having a head at one end and a reduced portion at its outer end, the shoulder adjacent said reduced portion being at an oblique angle with the axis of said pin, said pin being positioned in said bores so that said shoulder is parallel with the drilling axis of the tool, a washer set in said counterbore and secured on said reduced portion against said shoulder whereby said pin is held against rotary and longitudinal movement, and a cutterjournalled on said pin. 7 I a In witness that I claim the foregoing I have hereunto subscribed my name this 7th day of September, 1929.

JOHN T. PHIPPS. 

